The genuine args-Array in a setInterval or setTimeout call contains the function to be called and the delay. The arguments for the function start at the third position. By passing the arguments like this, the function invoked will get an array as argument that contains the function itself and the delay and the expected needed arguments.

Sample:
setInterval((name) => console.log('my name:', name), 100, 'Emanuel')
expected call:
('Emanuel') => console.log('my name:', 'Emanuel')
actual call:
([function, 100, 'Emanuel') => console.log('my name:', [function, 100, 'Emanuel'])